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I’ve tried to model this setup:
http://kschwebke.webng.com/povray/ior-interfaces/drawing.png with the following SDL:
http://kschwebke.webng.com/povray/ior-interfaces/rs2.pov.txt

A small overlap between the two transparent solids is needed, because a gap
would lead to total reflection. The camera in the test scene looks in the
direction of the ray in the setup drawing. The setup is surrounded with angular
markers, so one can easily read the final resulting looking angle.

POV-Ray 3.6.1 renders the expected result (~53° in the center of the screen):
http://kschwebke.webng.com/povray/ior-interfaces/rs2-35.jpeg

POV-Ray 3.7.0b35a (compiled Unix source) renders a different
(and in my opinion wrong) angle (~67°), however – for the very same scene file:
http://kschwebke.webng.com/povray/ior-interfaces/rs2-37b35a.jpeg

I’ve started a discussion about this issue in povray.beta-test: http://news.povray.org/povray.beta-test/thread/%3Cweb.4bba4677730ab9f3e8c084b40%40news.povray.org%3E/

All linked documents are also attached.