Adds support for planar orientation tensors, planar closure approximations, and reconstruction of planar distribution functions. These functions allow all results from C. L. Tucker, "Planar Fiber Orientation: Jeffery, Non-Orthotropic Closures, and Recovering Distribution Functions," submitted to J. Non-Newt. Fluid Mech., June, 2022, to be calculated. Many of the calculations are demonstrated in live-script examples.