It also eliminates any ring around {HEAD ~ the top side} of {TAIL ~ the target}, allowing the entire area of the cathode to provide the coating 
of
It also eliminates any ring around { HEAD ~ the top side } of { TAIL ~ the target } , allowing the entire area of the cathode to provide the coating
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH