 Poly(ethylene terephthalate)-foil (PET) is a common choice, due to its low cost and moderately high temperature stability.Poly(ethylene naphthalate)- (PEN) and poly(imide)-foil (PI) are higher performance, higher cost alternatives.Paper's low costs and manifold applications make it an attractive substrate, however, its high roughness and high wettability have traditionally made it problematic for electronics.