A plane-to-plane joint is configured for securing planar segments of one or more sheet materials together without the need for additional fasteners. The plane-to- plane joint includes a first planar segment having an upper planar surface, a second planar segment having a lower planar surface, a joinder structure monolithically formed on the first planar segment, the joinder structure including a transition zone located below the upper planar surface and a registration zone extending upwardly from the transition zone and out-of-plane from the planar segment, and an aperture in the second planar segment for receiving the joinder structure. The aperture is dimensioned and configured to cooperate with the registration zone of the joinder structure to register the relative position of the first and second planar segments when the lower planar surface abuts against the upper surface. A method of making and using the plane-to-plane joint is also disclosed.