  We explore the duality between supersymmetric Wilson loop on null polygonal
contours in maximally supersymmetric Yang-Mills theory and next-to-maximal
helicity violating (NMHV) scattering amplitudes. Earlier analyses demonstrated
that the use of a dimensional regulator for ultraviolet divergences, induced
due to presence of the cusps on the loop, yields anomalies that break both
conformal symmetry and supersymmetry. At one-loop order, these are present only
in Grassmann components localized in the vicinity of a single cusp and result
in a universal function for any number of sites of the polygon that can be
subtracted away in a systematic manner leaving a well-defined supersymmetric
remainder dual to corresponding components of the superamplitude. The question
remains though whether components which were free from the aforementioned
supersymmetric anomaly at leading order of perturbation theory remain so once
computed at higher orders. Presently we verify this fact by calculating a
particular component of the null polygonal super Wilson loop at two loops
restricting the contour kinematics to a two-dimensional subspace. This allows
one to perform all computations in a concise analytical form and trace the
pattern of cancellations between individual Feynman graphs in a transparent
fashion. As a consequence of our consideration we obtain a dual conformally
invariant result for the remainder function in agreement with one-loop NMHV
amplitudes.
