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