I got a MATH question I don't know how to solve...

I want to know the difference between running traces
parallel on the same layer (side by side) compared
to running them on different layers right on top of
each other (broadside).

I know won't be a simple answer,
so I will provide a simple example:

Say I am using 6mil traces with 6mil clearances on
layers that are 6mil apart using half ounce copper
(which is nearly .6mils) and both layers are internal.

What distance can I route side by side and get the
same coupling as if I had routed them broadside?

So I want a simple thing to remember that says
something like, "traces routed 1 inch in parallel will
couple the same amount as traces routed .2 inches
broadside (layer to layer)

Does anyone know how to make my rule-of-thumb?
and if I change to 1oz copper, will the rule double?

onward thru the fog,
Jack

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