Because stainless steel is the material typically used for the boat for {HEAD ~ PSG deposition}, the linear coefficient of thermal expansion of {TAIL ~ the boat} is significantly greater than that of PSG 
Because stainless steel is the material typically used for the boat for { HEAD ~ PSG deposition } , the linear coefficient of thermal expansion of { TAIL ~ the boat } is significantly greater than that of PSG
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH