for me 0.5° is HUGE, but I live here
that paper is concerned with sintering, extrapolation to 'other' things is questionable
oxidation includes the faint discoloration over time to the thick black crust that forms on copper when it is cherry red and exposed to oxygen (air)
so does the discoloration affect the thermal resistance of the TIM joint ?
based on my (relatively crude) testing I would say not,
if I cannot measure it I lump its effects with all the other uncontrolled variables associated with the procedure and component - see 'fouling' of HXs
Inchoerent is generating good values to 4 decimal places, perhaps he would be interested
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