Patent ID: 7084427

Claim:
An overlay shift determination structure comprising: a plurality of probe members in a first layer, the first layer including a first axis and a second axis perpendicular to the first axis, a first probe member and a second probe member of the plurality of probe members being disposed along a first axis and a third probe member of the plurality of probe members being disposed perpendicular to the first probe member and the second probe member, a fourth probe member of the plurality of probe members being disposed perpendicular to the first probe member and the second probe member; and an overlay target in a second layer, at least a portion of each probe member of the plurality of probe members partially overlapping and being connected to the overlay target, wherein a current is applied across at least three pairs of probe members, wherein each pair of probe members comprises two of the first probe member, the second probe member, the third probe member and the fourth probe member; and a voltage is measured across at least three pairs of probe members.