  Using Chandra archival data, we have begun a study to quantify the evolution
of cluster morphology with redshift. To quantify cluster morphology, we use the
power ratio method developed by Buote and Tsai (1995). Power ratios are
constructed from moments of the two-dimensional gravitational potential and
are, therefore, related to a cluster's dynamical state. Our sample will include
around 50 clusters from the Chandra archive with redshifts between 0.11 and
1.1. These clusters were selected from two fairly complete flux-limited X-ray
surveys (the ROSAT Bright Cluster Sample and the Einstein Medium Sensitivity
Survey), and additional high-redshift clusters were selected from recent ROSAT
flux-limited surveys. Here we present preliminary results from the first 15
clusters in this sample. Of these, eight have redshifts below 0.5, and seven
have redshifts above 0.5.
