Can I use a really large-area node to short features together in LCGEN, RSURF, and RGEN?
Because ideal shorts do not practically exist, shorting should be done consistently with that done on a real structure undergoing measurement: The use a wide, very-low-resistivity finite sheet is recommended. Where loop inductances are small, appropriate use of a pair of such sheets can often minimize the extraneous inductance associated with the pair.
