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