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Date: Sat, 29 Oct 2011 19:45:12 -0400
From: gene glick <geneglick AT optonline DOT net>
Subject: Re: [geda-user] swapping layers
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On 10/29/2011 07:15 PM, gene glick wrote:
> Is it possible to swap layer-2 and layer-3, for example, on a 4 layer
> board? I realize the gerbers can easily be swapped at fab time. But, am
> wondering if it can be done from within PCB?
>
>

Maybe I'll try to answer my own question :)  I just opened up the .pcb 
file and see 2 sections :
Layer(2 "GND - L2")
Layer(3 "PWR - L3")

Is it as simple as changing it like this?:
Layer(3 "GND - L3")
Layer(2 "PWR - L2")