  Chern plethysm (introduced by Billey, Rhoades, and Tewari) is a geometric way
to produce Schur positive symmetric polynomials. We present combinatorial
interpretations for the Schur expansions of special cases of Chern plethysm. We
also exhibit a symmetric group module whose Frobenius characteristic is (a
symmetric function analog of) one of these cases, generalizing a result of
Reiner and Webb.
