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TPS63020: thermal resistance

Part Number: TPS63020

The datasheet indicates a junction to ambient thermal resistance value of 41.8 ° C / W: if I mount the component on a four-layer printed circuit with a surface of 2500 mm2 and I cover it with a 1 mm thick layer of resin which has a thermal conductivity of 0.15 W / (m ° C) which value of total thermal resistance can I expect?