Different As-soak time is applied during InSb-like interfaces growth of InAs/AlSb superlattices on GaAs(100)substrates.The interface roughness is studied by grazing incidence X-ray reflectivity.The reflectivity curves are simulated by standard software and the rms roughness of the interfaces is obtained.It was shown that the sample with As-soak time of 20 seconds has the most smooth interfaces.By analyzing the microscope images of the samples,we suggest that In-rich interfaces will be formed with too short ...