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 in accordance with a set of rules that specify requirements for electromagnetic (EM) simulation; and 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, wherein EM simulation of the electronic system per the second layout is simpler than EM simulation of the electronic system per the first layout.