Most of my experience with heat damage has to do with monolitic structure, depending on the purity of the mix, failure is propagated with variable absorption/loss of heat. Fractures are frequently complete, through the width of the material.
With a laminated application, geometry plays an important part, introducing radial differentials at adhered surfaces, and mechanical stresses that vary dependent on the expansion rate of each layer. It strikes me the rate of heat gain and loss would be different at the rolled returns of each layered mass.
How brittle is the paste? How resilient? The metal foil would behave well in mechanical stress, but conduct heat very differently than the anode cathode.
The Poly film would seem to be the most vulnerable to heat and mechanical stress.
There must be a Thermal engineer here?