Preferably the substrate body is formed of {HEAD ~ silicon}, the substrate body face is highly polished, the base coating is substantially pinhole free and scratch free, and {TAIL ~ the carbon layer} is of uniform thickness 
Preferably the substrate body is formed of { HEAD ~ silicon } , the substrate body face is highly polished , the base coating is substantially pinhole free and scratch free , and { TAIL ~ the carbon layer } is of uniform thickness
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH