  Staggered Domain Wall Fermions (SDWF) combine the attractive chiral
properties of staggered fermions with those of domain wall fermions. SDWF
describe four flavors with exact U(1)xU(1) flavor chiral symmetry. An extra
lattice dimension is introduced and the full SU(4)xSU(4) flavor chiral symmetry
is recovered as its size is increased. Here, the free theory of SDWF is
described and a preliminary discussion of the interacting case is presented.
SDWF may be well suited for numerical simulation of lattice QCD thermodynamics.
