In {TAIL ~ certain embodiments}, {HEAD ~ surface} 501 is exposed to overlapping fields of electromagnetic radiation 
In
In { TAIL ~ certain embodiments } , { HEAD ~ surface } 501 is exposed to overlapping fields of electromagnetic radiation
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH