Layered Composite Structures for piezoelectric materials

Hello all,

I am very new to COMSOL and this might be a simple question. I am trying to simulate the piezoelectric voltage-charge behaviour of a PZT stack. Therefore, it has a alternative layered structure between PZT and substrate layers. I followed the video lesson in https://uk.comsol.com/video/modeling-layered-composite-structures-with-comsol-multiphysics-nov-29-2018, but the drop down menu from the solid mechanics doesnt support layered elastic material.

Is there another simplier way of simulating layered piezoelectric behaviour?

Thanks in advance! Akki.