Richard, why inserting a resistor in the GND line, at all? In my opinion this is entirely useless. Usually, everything is done to decrease the impedance of GND, by using one or even more solid ground planes, additional GND pins per chip package, paralleling of ground vias, etc. Everything, to decrease ground bounce and ground noise as much as ever possible. Why the hell now introducing again GND impedances, or even inductances??? What do you hope to filter out by these impedances? I don't see any benefit, but just the opposite!!

You can add GND impedances, if two separate parts have to be connected to another, which are not referenced to the same GND potential. Something like common mode fitering, etc. But here, you have a chip that is referenced to the one and only GND potential, with inputs referenced to the one and only GND potential. This chip even doesn't provide symmetrical inputs, which could remove GND noise. Think about fast edges hitting the chip. Additional GND impedances would only result in increased ground bounce and destroyed noise margins. Why should I ever do this??

Kai