Metal alloys for the reflective or {TAIL ~ the semi reflective layer} of {HEAD ~ an optical storage medium} 
Metal alloys for the reflective or { TAIL ~ the semi reflective layer } of { HEAD ~ an optical storage medium }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD