R. Sabeti et al., STEADY-STATE TEMPERATURE PROFILE FOR A THIN-FILM RESISTOR UNDER BIAS - RESPONSE, Journal of applied physics, 74(8), 1993, pp. 5291-5291
Although the thermal conductivities of silicon and silicon dioxide do
vary with temperature, minimal change would result from a temperature
rise of 50-degrees-C, from room temperature to 350-degrees-C. as is th
e case in the application in question.