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