A trench may be formed in the metal layer to create {HEAD ~ sections} in {TAIL ~ the metal layer}, and a portion of the trench may include an insulator 
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A trench may be formed in the metal layer to create { HEAD ~ sections } in { TAIL ~ the metal layer } , and a portion of the trench may include an insulator
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH