A semiconductor device comprises a substrate, a first conductive layer formed on the substrate and comprising a first layer and a second layer formed on the first layer and having at least one of a convex and a concave, an insulating layer formed on the one of the convex and the concave of the first...http://www.google.com/patents/US5869858?utm_source=gb-gplus-sharePatent US5869858 - Semiconductor device for reducing variations in characteristics of the device
