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Multi-layer Structures in Microwave Office

Hi Community

I'm using Microwave Office 2002.
I have a multi-layer structure.
Until now - for defining a metalization-layer - I always used a
dummy-layer having a thickness of nearly 0 with characteristics of air.
Is this ok like this - or are there any trade-offs?
....I was not sure wether metalization layers are put on top or at the
bottom of a defined layer...