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