Defining a Layered Material Stack
It is common that different layered materials are stacked on top of each other to build a composite laminate. An example is a laminate having the stacking sequence [A/B/C/B/A] where A, B, C are three different layered materials or sub-laminates.
To simplify such modeling, use the Layered Material Stack node under the Materials node within a component. In a Layered Material Stack, you define the position and laminate coordinate system similar to what is done in a Layered Material Link. You can link multiple layered materials in the stacking order. An example of a layered material stack having three different layered materials is shown in Figure 3-12.
Figure 3-12: Example of a layered material stack having three different (A,B,C) layered materials.
Note that it is also possible to add a Layered Material node directly under the Layered Material Stack node.
 
In the COMSOL Multiphysics Reference Manual: Layered Material Stack