 This study has developed novel hexalayer, HL, nanocomposite films composed of two inorganic 2D nanoplatelets, including magnesium aluminum layer double hydroxide, MGL-LDH, and hexagonal boron nitride, HBN, and two oppositely charged polyelectrolytes, namely polyethylene amine, PA, and polysodium styrene for sulfonate, PSS. These films were then used to create multiple layers of hexalayer, HL, nanocomposites on top of polyethylene terephthalate, PET, substrates to improve their gas barrier properties. This resulted in a self-healable barrier film, which can be used for flexible electronic device packaging applications. This article was authored by Sadiq Mahmoud, Amer Khan, Chandra Kant, and others.