  S-duality domain walls are extended objects in supersymmetric gauge theories
with several rich physical properties. This paper focuses on 3d N=2 gauge
theories associated with S-duality walls in the 4d N=2 SU(N) gauge theory with
2N flavours. The theories associated with multiple duality walls are
constructed by gluing together a basic building block, which is the theory
associated with a single duality wall. We propose the prescription for gluing
many copies of such a basic building block together as well as present the
prescription for self-gluing. A number of dualities between such theories are
discovered and studied using the supersymmetric index. This work generalises
the notion of the S-fold theory, which has been so far studied extensively in
the context of duality walls in the 4d super-Yang-Mills theory, to the theory
with lower amounts of supersymmetry.
