Maybe SRBP printed circuit board, though it's usually 1.6mm thick which is 0.063", and a couple of thou less if you strip off the copper.
Or paxolin sheet, like this 0.0625" stuff LINK
Edit: I see that Tufnol themselves do a 2mm (0.079" )thickness ANOTHER LINK . Don't know what the minimum quantity is, though, and I think there's a tolerance of plus or minus 5%..
Andy
Edited By Andyf on 16/08/2012 11:00:33
Edited By Andyf on 16/08/2012 11:01:57