A source/drain impurity area may be formed over a second silicon layer on {HEAD ~ both sides} of {TAIL ~ a gate electrode} 
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A source / drain impurity area may be formed over a second silicon layer on { HEAD ~ both sides } of { TAIL ~ a gate electrode }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL