Rear or second substrate 14 includes at least one layer or coating of metallic conductive (such as a layer of silver, aluminum or an alloy of silver or an alloy of aluminum or other metal or metal alloy) or non-metallic semi-conductive material (such as an ITO layer or the like) 20 disposed on a forward or third surface 14 a of rear substrate 14 (shown in FIGS. 5 and 6 as three layers).