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Two-layer alumite has been synthesized by three-step anodizing such that the 1st layer was formed by commonly known two-step anodizing at a prescribed voltage and the 2nd layer was formed at two-times higher anodizing voltage, in suitable electrolytes. When the 2nd layer is formed at an ordering voltage, alternate pores of the 1st layer continue growing through the 2nd layer, in a regular pattern...