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A layered superconductor with a full pairing energy gap can be driven into anodal superconducting (SC) state by inter-layer pairing when the SC statebecomes more quasi-3D. We propose that this mechanism is responsible for theobserved nodal behavior in a class of iron-based SCs. We show that the intra-and inter-layer pairings generally compete and the gap nodes develop on one ofthe {\em hole} Fermi surface pockets as they become larger in theiron-pnictides. Our results provide a natural explanation of the c-axis gapmodulations and gap nodes observed by angle resolved photoemissionspectroscopy. Moreover, we predict that an anti-correlated c-axis gapmodulations on the hole and electron pockets should be observable in the$S^{\pm}$-wave pairing state.

Inter-layer Superconducting Pairing Induced c-axis Nodal Lines in Iron-based Superconductors