Need help in HiperTFS7708H device temperature coefficient R-theta (J-C)

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Hi all,
I am designing a power supply using HiperTFS 7708H Product. Peak Power is 520 W for 1 sec and average Power is 360 W. the operation of the power supply is intermittent with duty cycle of 40%.
I want to design heat sink for HiperTFS, i searched the datasheet but i could not find data related ti temperature coefficient of HiperTFS.
It is mentioned that the temperature of HiperTFS should not increase beyond 95 deg cel.
I intent to limit it to 85 deg cel in worst condition but for that R-theta(J-c) is essential value which is missing from datasheet. It would be great if you can provide the same.
awaiting your reply.

thanks