I am doing linear simulation that makes use of S-parameter files from vendor and PCB layout dimension. Since the leads on 0402 component overlap part of the pads when mounted on the PCB, should I using the whole length of the pad from layout or shorten the pad by the overlapping amount (normally 10 mils) in simulation? This is especially troublesome for inductor where an extra 20 mils (10 mils from each lead) can make a difference in frequency response at 2GHz. Thank you for your attention. Any answer is welcome.