Device 7 wherein said thin elements have {HEAD ~ a thickness} of {TAIL ~ from 30 to 80 nm} 
of
Device 7 wherein said thin elements have { HEAD ~ a thickness } of { TAIL ~ from 30 to 80 nm }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL