The layer 142 containing {HEAD ~ nitride} may be formed in {TAIL ~ the same manner} as the first embodiment 
The layer 142 containing { HEAD ~ nitride } may be formed in { TAIL ~ the same manner } as the first embodiment
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH