Patent ID: 7068833

Claim:
An overlay mark for determining a relative shift between two or more successive layers of a substrate, the overlay mark comprising: at least one test pattern for deter the relative shift between a first and a second layer of the substrate in a first direction, the test pattern having a first set of working zones and a second set of working zones, the first set being disposed on a first layer of the substrate and having at least two working zones diagonally opposed and spatially offset relative to one another, the second set being disposed on a second layer of the substrate and having at least two working zones diagonally opposed and spatially offset relative to one another, each of the working zones having a periodic structure positioned therein, each of the periodic steps including a plurality of coarsely segmented elements that are each formed from a plurality of finely segmented elements, the plurality of finely segmented elements being evenly divided over the entire coarsely segmented elements.