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