Greeping waves in the chadow area of the $3D$ Fock problem

This paper is direct extension of the article [5] devoted to the exploration of the Fock’s problem in 3D case. Namely, in the paper propagation of the creeping waves in the shadow area of the diffraction obstacle is studied. The creeping waves stem from the reflected wave in the solution of the problem in a vicinity of the light-shadow boundary on the surface of the diffraction obstacle and then they are prolonged into shadow area. The main results of the paper are the initial data for the prolongation procedure.