<p>Anisotropic thin-layered structures in the atmosphere are investigated both theoretically and numerically. These formations may be interpreted as internal gravity waves (IGWs) with vertical lengths significantly smaller than the horizontal wavelengths and vertical stratification scales. Approximate analytical expressions describing the spatial configuration of such waves are derived. A novel method is proposed for using these fine-scale structures for initialization of a high-resolution nonlinear numerical atmospheric model in the form of effective wave sources. These sources generate anisotropic turbulence over a finite time interval and are deactivated when the target structures are established. Consequently, the resulting fine-scale formations are fully governed by nonlinear hydrodynamic equations. Examples of simulations of various thin-layered structures are presented. The results provide a robust framework for conducting numerical studies of fine-scale layers caused by IGW propagation in the atmosphere.</p>