diff --git a/RecoMTD/DetLayers/plugins/ETLDetLayerGeometryBuilder.cc b/RecoMTD/DetLayers/plugins/ETLDetLayerGeometryBuilder.cc
index 810adc6fc948f..81f0597d9835b 100644
--- a/RecoMTD/DetLayers/plugins/ETLDetLayerGeometryBuilder.cc
+++ b/RecoMTD/DetLayers/plugins/ETLDetLayerGeometryBuilder.cc
@@ -66,7 +66,10 @@ pair<vector<DetLayer*>, vector<DetLayer*> > ETLDetLayerGeometryBuilder::buildLay
       }
     }
   }
-  pair<vector<DetLayer*>, vector<DetLayer*> > res_pair(result[0], result[1]);
+  //
+  // the first entry is Z+ ( MTD side 1), the second is Z- (MTD side 0)
+  //
+  pair<vector<DetLayer*>, vector<DetLayer*> > res_pair(result[1], result[0]);
   return res_pair;
 }
 
diff --git a/RecoMTD/DetLayers/test/MTDRecoGeometryAnalyzer.cc b/RecoMTD/DetLayers/test/MTDRecoGeometryAnalyzer.cc
index f7f50a5454b41..cc146357fca6f 100644
--- a/RecoMTD/DetLayers/test/MTDRecoGeometryAnalyzer.cc
+++ b/RecoMTD/DetLayers/test/MTDRecoGeometryAnalyzer.cc
@@ -86,6 +86,20 @@ void MTDRecoGeometryAnalyzer::analyze(const Event& ev, const EventSetup& es) {
     LogVerbatim("MTDLayerDump") << "  " << static_cast<int>(dl - geo->allETLLayers().begin()) << " " << dumpLayer(*dl);
   }
 
+  LogVerbatim("MTDLayerDump") << "\n*** allForwardLayers(): " << std::fixed << std::setw(14)
+                              << geo->allForwardLayers().size();
+  for (auto dl = geo->allForwardLayers().begin(); dl != geo->allForwardLayers().end(); ++dl) {
+    LogVerbatim("MTDLayerDump") << "  " << static_cast<int>(dl - geo->allForwardLayers().begin()) << " "
+                                << dumpLayer(*dl);
+  }
+
+  LogVerbatim("MTDLayerDump") << "\n*** allBackwardLayers(): " << std::fixed << std::setw(14)
+                              << geo->allBackwardLayers().size();
+  for (auto dl = geo->allBackwardLayers().begin(); dl != geo->allBackwardLayers().end(); ++dl) {
+    LogVerbatim("MTDLayerDump") << "  " << static_cast<int>(dl - geo->allBackwardLayers().begin()) << " "
+                                << dumpLayer(*dl);
+  }
+
   LogVerbatim("MTDLayerDump") << "\n*** allLayers(): " << std::fixed << std::setw(14) << geo->allLayers().size();
   for (auto dl = geo->allLayers().begin(); dl != geo->allLayers().end(); ++dl) {
     LogVerbatim("MTDLayerDump") << "  " << static_cast<int>(dl - geo->allLayers().begin()) << " " << dumpLayer(*dl);
@@ -109,6 +123,21 @@ void MTDRecoGeometryAnalyzer::testBTLLayers(const MTDDetLayerGeometry* geo, cons
                                 << " rods = " << std::setw(14) << layer->rods().size() << " dets = " << std::setw(14)
                                 << layer->basicComponents().size();
 
+    unsigned int irodInd(0);
+    for (const auto& irod : layer->rods()) {
+      irodInd++;
+      LogVerbatim("MTDLayerDump") << std::fixed << "\nRod " << irodInd << " dets = " << irod->basicComponents().size()
+                                  << "\n";
+      for (const auto& imod : irod->basicComponents()) {
+        BTLDetId modId(imod->geographicalId().rawId());
+        LogVerbatim("MTDLayerDump") << std::fixed << "BTLDetId " << modId.rawId() << " side = " << std::setw(4)
+                                    << modId.mtdSide() << " rod = " << modId.mtdRR() << " mod = " << std::setw(4)
+                                    << modId.module() << std::setw(14) << " R = " << imod->position().perp()
+                                    << std::setw(14) << " phi = " << imod->position().phi() << std::setw(14)
+                                    << " Z = " << imod->position().z();
+      }
+    }
+
     const BoundCylinder& cyl = layer->specificSurface();
 
     double halfZ = cyl.bounds().length() / 2.;