One known way to improve the efficiency of glow discharge sputtering is to use magnetic fields to confine {HEAD ~ electrons} to the glow region in {TAIL ~ the vicinity} of the cathode/target surface 
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One known way to improve the efficiency of glow discharge sputtering is to use magnetic fields to confine { HEAD ~ electrons } to the glow region in { TAIL ~ the vicinity } of the cathode / target surface
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH