diff --git a/_unittest/test_09_VariableManager.py b/_unittest/test_09_VariableManager.py
index 1fd01c51075..cd8e828b5c6 100644
--- a/_unittest/test_09_VariableManager.py
+++ b/_unittest/test_09_VariableManager.py
@@ -668,6 +668,8 @@ def test_32_delete_unused_variables(self):
         self.aedtapp.modeler.create_rectangle(0, ["used_var", "used_var", "used_var"], [10, 20])
         mat1 = self.aedtapp.materials.add_material("new_copper2")
         mat1.permittivity = "$project_used_var"
+        assert self.aedtapp.variable_manager.is_used("used_var")
+        assert not self.aedtapp.variable_manager.is_used("unused_var")
         assert self.aedtapp.variable_manager.delete_variable("unused_var")
         self.aedtapp["unused_var"] = "1mm"
         number_of_variables = len(self.aedtapp.variable_manager.variable_names)
diff --git a/pyaedt/application/Variables.py b/pyaedt/application/Variables.py
index 48257aaadcd..e9cd41646af 100644
--- a/pyaedt/application/Variables.py
+++ b/pyaedt/application/Variables.py
@@ -19,6 +19,7 @@
 import os
 import re
 import types
+import warnings
 
 from pyaedt import pyaedt_function_handler
 from pyaedt.generic.constants import AEDT_UNITS
@@ -1237,7 +1238,7 @@ def delete_variable(self, var_name):
         return False
 
     @pyaedt_function_handler()
-    def is_used_variable(self, var_name):
+    def is_used(self, var_name):
         """Find if a variable is used.
 
         Parameters
@@ -1268,6 +1269,27 @@ def is_used_variable(self, var_name):
                     return used
         return used
 
+    @pyaedt_function_handler()
+    def is_used_variable(self, var_name):
+        """Find if a variable is used.
+
+        .. deprecated:: 0.7.4
+           Use :func:`is_used` method instead.
+
+        Parameters
+        ----------
+        var_name : str
+            Name of the variable.
+
+        Returns
+        -------
+        bool
+            ``True`` when successful, ``False`` when failed.
+
+        """
+        warnings.warn("`is_used_variable` is deprecated. Use `is_used` method instead.", DeprecationWarning)
+        return self.is_used(var_name)
+
     def _find_used_variable_history(self, history, var_name):
         """Find if a variable is used.
 
@@ -1307,7 +1329,7 @@ def delete_unused_variables(self):
         var_list = self.variable_names
 
         for var in var_list[:]:
-            if not self.is_used_variable(var):
+            if not self.is_used(var):
                 self.delete_variable(var)
         return True
 
diff --git a/pyaedt/modules/LayerStackup.py b/pyaedt/modules/LayerStackup.py
index fed46ca06fc..05e010c8536 100644
--- a/pyaedt/modules/LayerStackup.py
+++ b/pyaedt/modules/LayerStackup.py
@@ -160,13 +160,13 @@ def __init__(self, app, layertype="signal", negative=False):
         # Rough option
         self._user = False
         self._RMdl = "Huray"
-        self._NR = 0.5
+        self._NR = 0.0005
         self._HRatio = 2.9
         self._BRMdl = "Huray"
-        self._BNR = 0.5
+        self._BNR = 0.0005
         self._BHRatio = 2.9
         self._SRMdl = "Huray"
-        self._SNR = 0.5
+        self._SNR = 0.0005
         self._SHRatio = 2.9
         # Solver option
         self._usp = False