diff --git a/dune-sequential.opts b/dune-sequential.opts
new file mode 100755
index 0000000000000000000000000000000000000000..6b5af3f7e50c500d39ac1cb6d598c95cbd163f2e
--- /dev/null
+++ b/dune-sequential.opts
@@ -0,0 +1,2 @@
+# set flags for CMake:
+CMAKE_FLAGS="-DCMAKE_CXX_FLAGS='-g -fdiagnostics-color=always -Wall -fmax-errors=2 -DHAVE_CSTDDEF' -DCMAKE_DISABLE_FIND_PACKAGE_MPI=TRUE -DUG_ENABLE_PARALLEL=false -DCMAKE_BUILD_TYPE=Debug" 
diff --git a/dune/microstructure/materialDefinitions.hh b/dune/microstructure/materialDefinitions.hh
index 307de33c632fdfac963de2fc896abf95d534d3cb..f4e6ee147907235ef1ce01212139d2e0a668a59f 100644
--- a/dune/microstructure/materialDefinitions.hh
+++ b/dune/microstructure/materialDefinitions.hh
@@ -35,7 +35,7 @@ using VectorRT = FieldVector< double, 3>;
       const FieldVector<double,3> mu     = {80.0, 80.0, 60.0};
       const FieldVector<double,3> lambda = {80.0, 80.0, 25.0};
       if (phase == 1)
-        return 2.0 * mu[0] * sym(G) + lambda[0] * trace(sym(G)) * Id(); //#Phase1
+        return 2.0 * mu[0] * sym(G) + lambda[0] * trace(sym(G)) * Id(); //#Phase1 //Isotrop(mu,lambda)
       else if (phase == 2)
         return 2.0 * mu[1] * sym(G) + lambda[1] * trace(sym(G)) * Id(); //#Phase2
       else