Two-Dimensional XRD Pattern (image) International Union of Crystallography Share Print E-Mail Caption This is a two-dimensional XRD pattern for the Rocknest aeolian bedform (dune). Credit David Bish et al. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.