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