1. The problem statement, all variables and given/known data If a metal is adhered to a surface of another metal, let's say copper is plated onto aluminum, how can the elastic modulus of copper can be extracted given only the data of the thickness of the copper and aluminum, the young's modulus of the combined metal and the modulus of the copper. 2. Relevant equations Young's modulus equation is the only thing i can think of which is E = Stress/Strain 3. The attempt at a solution Tried to plug in the values by breaking down the stress into F/A = (F/L*W) in which W is the thickness of copper and aluminum but the moduli left untouched.