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Each structure of Geometry seems to be able to select only one specific material, so how to combine the two materials into one object?  For example, if I want to design a hafnium oxide/aluminum oxide laminated (HAOL) gate dielectric, how can the electrical parameters of these two materials be simultaneously assigned to a structure?  

[kghaffari]

Hi,
Could you please elaborate on how this feature would be helpful? At each point in the simulation region only a single value for a material property is used by the solver. So you should be able to account for that with one of the two materials (and objects) or an object with a new effective material property (which will be user input).