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