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As has been pointed out, the conductive paper imposes boundary
conditions that may be dealt with via an image charge technique.
I have asked Maple to do some calculations to help me visualize
the results. It was happy to oblige, but suggested that I share
its findings with the world. I like to keep my Maple happy, so
please see
<http://www.csupomona.edu/~ajm/special/condsheet.pdf>
.... I also believe that the final size is an important factor
but I can not prove or disprove it. The only thing I can
do is to show that there is big discrepancy. Only a
theoretical physicist can do this. The task is to compare
theoretical curves for the sheet of final size with those
calculated for the unlimited size. If the final size of the
sheet is the only factor then what is calculated for the
12" by 9" sheet should agree with what is observed
experimentally. The sheet thickness is very uniform
(always 0.013 mm) and rho=0.32 ohm*m. ...