diff --git a/materials/Acrylglas_32__40_Plexiglas_44__32_PMMA_41_.xml b/materials/Acrylglas_32__40_Plexiglas_44__32_PMMA_41_.xml
index bdfe502..edd1b48 100644
--- a/materials/Acrylglas_32__40_Plexiglas_44__32_PMMA_41_.xml
+++ b/materials/Acrylglas_32__40_Plexiglas_44__32_PMMA_41_.xml
@@ -7,6 +7,7 @@
   <color>#4ab5ff</color>
   <name>Acrylglas (Plexiglas, PMMA)</name>
   <materialThicknesses>
+    <float>2.0</float>
     <float>3.0</float>
     <float>4.0</float>
   </materialThicknesses>