Unfortunately this problem does not appear to be well posed.
Retention = (b0*Area^(th+1))^b
If b0, th, and b are the parameter only the product (th+1)*b is determined.
This comes from noting that powers satisfy
(a^b)^c = a^(b*c)
So your model can be written as
(b0^b) * Area^((th+1)*b)
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