Defoamer compositions are disclosed and methods for making and using same, where the defoamer has universal applicability at low concentrations. The semiconductor structure includes a device layer, and the device layer in turn includes active regions separated by predefined spacings. The apparatus further comprises fiber splitters coupled to each laser source to provide at least eight beams from at least four laser sources. An input shaft is rotatably journaled to and extends between the cylindrical housing and the carrier plate. The laser receiver has an optical detector with an adjustable field of view and gain to minimize background light noise and to demodulate the received modulated scattered laser beams. According to one embodiment, a resistance variable memory device is provided having at least one tin-chalcogenide layer proximate at least one chalcogenide glass layer.