The optical storage {HEAD ~ medium} 4, wherein said {TAIL ~ second reflective layer} includes said metal alloy 
wherein
The optical storage { HEAD ~ medium } 4 , wherein said { TAIL ~ second reflective layer } includes said metal alloy
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH