As depicted in FIG 4B, the exposed surface of {HEAD ~ substrate} 116 is coated with {TAIL ~ a silicon nitride layer}, with or without an underlying silicon dioxide layer, to produce an insulating layer 404 
As depicted in FIG 4B , the exposed surface of { HEAD ~ substrate } 116 is coated with { TAIL ~ a silicon nitride layer } , with or without an underlying silicon dioxide layer , to produce an insulating layer 404
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH