Off-shell Formalism for Ali-Ilahi's ADHM Instanton Sigma Model

In this brief note we present the off-shell superspace formalism for Ali-Ilahi’s $(0,4)$ supersymmetric ADHM instanton linear sigma model in harmonic superspace. Ali-Ilahi’s model is dual to the $(0,4)$ supersymmetric ADHM instanton linear sigma model constructed by Witten in 1995.