1. A composite article, comprisingat least two layers of a composite formulation, the composite formulation of each layer including a thermoplastic polymer matrix and conductive particles distributed within the polymer matrix, the conductive particles including a concentration of, by volume, between 20% and 50% of the composite formulation; wherein the conductive particles comprise tin-coated copper particles having a copper/tin volume ratio of between 3/1 and 3/2;
wherein the conductive particles in each of the at least two layers include at least one morphology selected from the group consisting of fibrous, dendritic, and flake; and
wherein the morphology of the conductive particles in one of the at least two layers differs from the morphology of the conductive particles in another one of the at least two layers.