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