| http://www.w3.org/ns/prov#value | - According to another aspect of the invention, there is provided a double sided optical surface comprising: a stress free substrate, the substrate comprising a first and second surface; an adhesion layer on each of the first and second surfaces of the substrate, each adhesion layer including a first adhesion layer and a second adhesion layer; and a top layer on each of the adhesion layers, the top
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