{HEAD ~ A number} of these alloys can also be used as semi reflective layers in optical storage devices such as {TAIL ~ DVD dual layer devices} 
{ HEAD ~ A number } of these alloys can also be used as semi reflective layers in optical storage devices such as { TAIL ~ DVD dual layer devices }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL