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