  We obtained deep 8.5'x8.5' near-infrared images within four high-redshift
survey fields, measured the Ks magnitudes of 300 optically selected galaxies
with spectroscopic redshift 1.8<z<2.6, and compared the spatial clustering
strength of galaxies with Ks<20.5 and Ks>20.5. We found at greater than 95%
confidence that the brighter galaxies cluster more strongly. The best-fit
correlation lengths for the bright and faint samples are 10+-3 and 4+-0.8
comoving Mpc/h, respectively (1sigma), although the unusual density of bright
QSOs in one of our survey fields may imply that the result is not
representative of the universe as a whole. Neglecting this possibility, the
correlation length for the optically selected sample with Ks<20.5 agrees well
with that reported for comparably bright near-IR-selected samples. The
differences in correlation length between optically selected and
near-IR-selected samples have been presented as evidence that the two
techniques find orthogonal populations of high-redshift galaxies. Our results
favor a more nuanced view.
