  We use a simplified model to study wave reflection and transmission at
interface of convective region and stably stratified region (e.g. radiative
zone in star or stratification layer in gaseous planet). Inertial wave in
convective region and gravito-inertial wave in stably stratified region are
considered. We begin with polar area and then extend to any latitude. Six cases
are discussed (see Table 1), and in Case 2 both waves co-exist in both regions.
Four configurations are further discussed for Case 2. The angles and energy
ratios of wave reflection and transmission are calculated. It is found that
wave propagation and transmission depend on the ratio of buoyancy frequency to
rotational frequency. In a rapidly rotating star or planet wave propagates
across interface and most of energy of incident wave is transmitted to the
other region, but in a slowly rotating star or planet wave transmission is
inhibited.
