An Integrated Circuit device, including: a base wafer including single crystal, the base wafer including a plurality of first transistors; at least one metal layer providing interconnection between at least a portion of the plurality of first transistors; a second layer of less than 2 micron thickness, the second layer including a plurality of second transistors, the second layer overlying the at least one metal layer; and at least one conductive structure constructed to provide power to a portion of the second transistors, where the provide power is controlled by at least one of the transistors.