First, if the VO2 layer is rough, {HEAD ~ an effective mixing} of {TAIL ~ the VO2} with air over a certain depth is obtained 
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First , if the VO2 layer is rough , { HEAD ~ an effective mixing } of { TAIL ~ the VO2 } with air over a certain depth is obtained
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH