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