Evanescent microwave laboratory project

Just looking for confirmation of a few thoughts and a couple of requests for information.

Firstly, there are two significant processes when observing evanescent waves between two prisms, right? Firstly, the evanescent wave travels along the boundary of the reflecting material and regenerates a new wave on the same heading when brought close to a second prism.

Secondly, the evanescent wave can tunnel into the second prism and recreate the original wave on the same vector as before, correct?

These are indeed two different processes, correct? Which of them would be easier to measure for an undergraduate lab?

Finally, where might I find reliable refractive indices for 3cm microwaves for perspex and paraffin?
 
Anybody?

Are my questions clear enough?
 

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