[SI-LIST] plane RLGC Debye model

hi 
how can i calculate the Ri, Li, Gi, Ci parameters for a frequency dependent 
unit-cell Debye RLGC model for a power/gnd plane pair? 1st order or up to 3rd 
order Debye model would be good. 
are there any equations? 
(Debye models introduce additional RL and GC elements into the 4 element 
original RLGC model to reflect the frequency-dependency, and with staying with 
basic circuit elements, suitable for spice)

i would like to make frequency dependednt spice 3f5 models (not w-element 
model, since its not compatible with most of the spices) from arbitrary power 
planes, with lumped-element grid. 
I found application notes where in the examples they just shown the calculated 
values, without describing the calculation.

regards,
Istvan Nagy
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