1. A method for automatically modifying an electronic system, comprising: storing a first layout of the electronic system in a memory; automatically generating a second layout of the electronic system based on the first layout, wherein said automatically generating the second layout comprises automatically modifying the first layout using a set of rules for electromagnetic (EM) simulation, wherein said automatically modifying operates to simplify an EM simulation of the electronic system; storing the second layout of the electronic system in the memory, wherein the second layout is usable to perform the EM simulation of the electronic system.