  The hole-doped 2D t-J model is studied by exact diagonalization on a 5 x 4
cluster which, unlike the standard tilted square clusters, can in principle
accomodate an antiphase domain wall. For hole concentration 10% and J/t >= 0.5
the ground state energy/site is lower than the conventional tilted square
20-site-cluster. In the ground state two holes form a loosely bound pair pinned
to an antiphase domain wall. The dynamical density correlation function shows
sharp quasiparticle-like peaks, reminiscent of the `holons' in 1D chains, which
suggest the existence of soliton-like, propagating domain walls. The dynamical
correlation function of the bond-singlet operator has a low-energy peak
structure characteristic of columnar Spin-Peierls order, the dynamical spin
correlation function shows an intense and isolated `resonance peak' near
(pi,pi).
