>> A system's entropy in statisical mechanics is k log W, where k is Boltzmann's constant and W is the number of microstates. The microstate is a configuration of, say, electrons in energy levels.

We are not freshman, in natural units (pretty much any system of natural units) Boltzmann's constant is 1. And entropy is measured in bits ('nats', but ln 2 is also equal to 1) ;) . For a system with two microstates entropy would be 1 bit.