dude_500
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one sided coating, the thickness of the diaphragm hardly matters to the E field, the force, balance since it is a small fraction of the spacing and the e_r of the Mylar even reduces the small effect of the thickness of the diaphragm more - do you really get the spacing/centering/flatness within few microns?
Here is the paper that outlines the concept of isolated coatings on each side: http://douglas-self.com/ampins/wwarchive/wwarchive.htm#diel
I went through the math a while back and it seems to be a correct assessment. Intuitively it seems absurd though, so possibly some math trick going on I fell for.