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Calculating pcb thermal cooling area

Hi,

I am trying to calculate the pcb thermal cooling area using the below formula:

Area = Pd x Theta_SA/(Tjunction -Tambient -Pd x(Theta_JC + Theta_CS))

where Pd = Power dissipation

Theta_SA = Thermal resistance surface to ambient

Theta_JC = Thermal resistance junction to case

Theta_CS = Thermal resistance case to surface

However, I could not find the values of the Theta in the datasheet. Can I know where can I get those values?

Appreciate your kind help!

Best Rgds

Ruzhan