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Thermal resistance of SMPS control chip [Rth(JA)]

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Flyback

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Hello,
On page 2 of the LTC3892 datasheet it says that the Rth(JA) for the LTC3892 is 30degC/W
Do you know what were the mounting conditions necessary to get that 30degC/W?
( eg....mounted on an FR4 PCB of 4 inches square and with 1 inch square of thermal copper on the top side connected to the heat pad, and thermal vias to the copper bottom of the board)?

LTC3892 Datasheet:
http://cds.linear.com/docs/en/datasheet/38921fb.pdf
 
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