The Perfectly Matched Layer physics feature that for version 5.2 and earlier versions was marked deprecated is no longer available. Thus, models using the Perfectly Matched Layer physics feature, must first be rebuilt in a version earlier than 5.2a to use the Perfectly Matched Layer feature from under the Definitions node, before being loaded in 5.2a.The parameter Port phase, which was previously located in the Port Properties section, is now called Mode phase and is located in the Port Mode Settings section. The API, however, has not changed.