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Recent experimental advances in creating stable dipolar bosonic systems,including polar molecules with large electric dipole moments, have led tovigorous theoretical activities. Recent reporting of observation of rotonfeature in dipolar erbium has provided added impetus to theoretical andexperimental work. Here we discuss our mean-field theory work on 2D andquasi-2D dipolar bosons with dipoles oriented at an angle to the directionperpendicular to the confining 2D plane, i.e. for {\it non-zero tilt angles}.Using Bogoliubov-de Gennes equations, we present results on a number of T=0properties of both 2D and quasi-2D systems, such as excitation spectra,structure functions, sound velocities, quantum depletion, etc. We exploreinstabilities at varying tilt angle, density and dipolar coupling. We map outphase diagrams as a function of tilt angle, dipole strength and density. Wefind the development of maxon-roton behavior leading to roton instabilities atlarge densities for small tilt angles, and at low densities for large tiltangles. The behavior is anisotropic in k-space; accordingly the rotoninstabilities occur first in the $k_y$ direction, suggestive of inhomogeneityand stripe phase, with density mode becoming soft in the $y$-direction. Beyonda critical tilt angle, at any density, the dipolar system collapses owing to aphonon instability. We discuss similarities and differences between theproperties of 2D and quasi-2D dipolar systems at non-zero tilt angles.

Properties of 2D and Quasi-2D Dipolar Bosons with Non-zero Tilt Angles at T=0