A molecularly flexible dielectric electronic substrate for receiving an electronic device has a modulus of elasticity less tan about 500,000 psi. The molecularly flexible dielectric substrate comprises one or more sheets or layers of a molecularly flexible dielectric adhesive having a modulus of elasticity less than about 500,000 psi and having patterned metal foil electrical conductors thereon. The molecularly flexible dielectric adhesive may have a low glass transition temperature and the ability to withstand soldering.