However, when {HEAD ~ the thickness} of {TAIL ~ an oxide} is 2 μm or less, the oxide is not be uniformly coated on the tungsten wire 
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However , when { HEAD ~ the thickness } of { TAIL ~ an oxide } is 2 μm or less , the oxide is not be uniformly coated on the tungsten wire
OTH OTH OTH 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 OTH OTH OTH OTH OTH