Cycles Plexiglas

Description:

An extremely simple clear plastic shader, like Plexiglas or Lexan. It's only 3 nodes! It's not my original idea; I saw it somewhere else that I don't remember, so it's CC0. Use it freely, don't credit me. I was surprised there wasn't a shader like this already on BlendSwap, actually.

As always, the material ball is from JC Levet (although I modified the scene to remove stuff that is out of camera, removed bubbles in the glass, and the subsurf indicators): http://www.blendswap.com/blends/materials/galvanized-steel-shader/