The last time I had this question, the result I came to was a geometric
progression. I don't remember the numbers. I do remember that I opted to
estimate  in this way. For example 2-4l was 2x, 2-6l was 8x. This might not apply
any more however. Somebody else probably has a better answer.

Scott
IDS

Jim Mathis wrote:

> Assuming all other considerations being equal (size, # of holes, hole sizes,
> etc.), what is the typical cost adder for going 4-layer from 2-layer?  1.5X,
> 2X. etc?
>
> Also, in an EMI-sensitive environment, how would you recommend the layer
> stack-up?  Signal 1, Ground, Supply, Signal 2  OR Ground, S1, S2, Supply?  OR
> something else?
>
> Thanks.