In this talk, I will discuss a new aspect of electronic properties in a 2D confinement based on the angle-resolved transport nonreciprocity measurement. Nonreciprocity is defined as the difference in DC resistance between forward and reverse current bias. The angular dependence of nonreciprocity offers unique perspectives regarding the symmetry axis of the underlying electronic states. I will show the evolution of angle-resolved transport nonreciprocity across the phase space of multi-layer graphene samples, where the flat energy band enhances Coulomb correlation and stabilizes a host of exotic quantum phases. By investigating the interplay between transport nonreciprocity, ferromagnetism, and superconductivity, the angle-resolved transport nonreciprocity offers an efficient new tool for probing properties of 2D electrons.