  We study the anisotropic spin-half antiferromagnetic triangular Heisenberg
lattice in two dimensions, seen as a set of chains with couplings J (J') along
(in between) chains, respectively. Our focus is on the incommensurate
correlation that emerges in this system in a wide parameter range due to the
intrinsic frustration of the spins. We study this system with traditional DMRG
using cylindrical boundary conditions to least constrain possible
incommensurate order. Despite that the limit of essentially decoupled chains
J'/J < 0.5 is not very accessible numerically, it appears that the spin-spin
correlations remain incommensurate for any finite 0 < J' < Jc', where Jc'/J >
1. The incommensurate wave vector q_J, however, approaches the commensurate
value corresponding to the antiferromagnetic correlation of a single chain very
rapidly with decreasing J'/J, roughly as q_J ~ pi - c_1 (J'/J)^n exp(-c_2
J/J').
