Well, I’ve watched Andrew’s stuff, and whilst it achieves a result, the actual physics is close to missing. The stuff in this thread is, on the other hand, making a virtual computer out of blender nodes by comparison.
But thank you for the links. Time to study 
Here’s a bit more technical… 
In case anyone is interested, I have merged this shader with a thin film interference shader that can be found here: https://blenderartists.org/forum/showthread.php?403299-UPDATE-Cycles-PBR-thin-film-interference-and-metals.
Now also interference in clear and absorbing layers on top of dielectrics and metals can be simulated
We need more videos like this to connect the artists a bit more with the underneath logic!
Good pick up!! 