Hi Nicholas,
I can run the simulation example successfully as well. And I also changed the material of the film from Si to SiO2, I don't see any issue with that too. After you partition the geometry, can you see that each domain is assigned the correct material:
After you partition, you can click on "Check" to see if there are any issues with the setup:
Do you see any error messages on doing that?
Regards,
Amrita
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