A few years ago there was a program out there that was used to calculate the CTE of boards reinforced with copper/Invar/copper . It employed the use of the different thicknesses, CTE and modulus of the of copper, laminate material, and CIC and came up with a CTE for of the finshed board. Does anyone know where I can get ahold of this program or any new program that does the same thing. Phil Hinton [log in to unmask]