The environmental data are specified in the standard SAFARI format. Just note that the interface rms roughness and correlation must be specified. These are not adopted from OASR or OAST, and may therefore be different than the ones used for computing the mean field. This allows you to use a Born approoximation where the mean field is computed without roughness. Note also that OASS will only compute reverb from one interface at a time, as specified in Block V. However, several rough interfaces may be specified in the environment block. The additional rough interfaces only have effect for secondary scattering, option p.