NEC-List: Wire Radi to printed conductor?

Has anybody looked into the relation between a NEC wire of radius r and a
printed conductor (copper trace or other such thing) of width 2r.

Is it just a matter of getting the impedance per unit length right?... any
rules of thumb, or am I going to have to start into the calculus.

I am sure I can find a reasonable solution, but it seems that this wheel may
have already been invented.

Thanks Guys.

Wayne Shanks

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