What can I safely put between my cast iron skillet and induction glass top stove to prevent scratches? I moved into a new flat and it comes with a brand-new induction glass top stove. Unfortunately, it seems like the glass rather easily scratches: There is already a visible scratch in it (likely caused by me, but I have no idea what caused it). This is why I don't want to put my Lodge cast iron skillet (with a rough bottom) directly on it. I've found several pages stating that I can easily prevent scratches by putting something between the cast iron skillet and the glass top, such as paper towels, newspaper or parchment paper, as long as I'm not going for a very high heat sear.

However, that is mostly the purpose of my cast iron skillet: To sear meat at very high temperature.

Has anyone used any of the above objects successfully as a protective layer between cast iron skillet and induction glass top, while searing at very high temperature? Or is some other sort of layer even more preferable?
You could use a thin disc of copper...

Copper has a much higher melting point than does aluminum (1,984ºF or 1,084ºC vs 1,221ºF or 661ºC), is not ferromagnetic, and a thin (.025" or less) sheet should not have a profound effect on the magnetic field induced in the iron skillet. 

I have not tried this method, but it is scientifically plausible as well as cost effective at about $25. 

The copper surface could be sanded smooth and could be used in a similar way as a heat diffuser. It should get no hotter than the bottom of the cast iron skillet, since the induction 'burner' should not induce any magnetic field in the copper sheet itself. The only heating of the copper would be from conduction or radiation from the cast iron pan.