Patent ID: 8471335

Claim:
A semiconductor structure comprising: a substrate of a semiconductor material; a first layer and a second layer formed on the substrate; and a first alignment control mask, the first alignment control mask including: a first direction reference element formed in a first region of the first layer and extending longitudinally in a first alignment direction; first position reference elements formed in a first region of the second layer corresponding to the first region of the first layer, wherein the first position reference elements are arranged in succession in the first alignment direction and in respective staggered positions with respect to a second alignment direction transverse to the first alignment direction a second direction reference element formed in a second region of the first layer and extending longitudinally in the second alignment direction; and second position reference elements formed in a second region of the second layer corresponding to the second region of the first layer, wherein the second position reference elements are arranged in succession in the second alignment direction and in respective staggered positions with respect to the first alignment direction.