Further, the electromagnetic radiation can be exposed on {HEAD ~ surface} 501 in {TAIL ~ the form} of a pattern  
in
Further , the electromagnetic radiation can be exposed on { HEAD ~ surface } 501 in { TAIL ~ the form } of a pattern
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH