Materials useful for the second optical layer include polyesters such as polyethylene terephthalate, polyethylene naphthalate, copolyesters or polyester blends based on naphthalene dicarboxylic acids; polycarbonates; polystyrenes; styrene-acrylonitriles; cellulose acetates; polyether sulfones; poly(methyl)acrylates such as polymethylmethacrylate; polyurethanes; polyvinyl chloride; polycyclo-olefin