prov:value
| - The multilayer structure of claim 4 wherein said dopant is a metallic material selected from the group consisting of Ti, Zr, Zn, Al, In, Pb, W, Cu, Sn, Cr, Fe, Mn, Sb, Co, Ba, and Mg, and mixtures thereof, and the amount thereof present in said SiO2 layer is about 0.5 to 30% based on the total weight of the layer.
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