{TAIL ~ A silver based alloy thin film} is provided for the highly reflective or semi reflective coating layer of {HEAD ~ optical discs} 
{ TAIL ~ A silver based alloy thin film } is provided for the highly reflective or semi reflective coating layer of { HEAD ~ optical discs }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD