[Kwant] Hopping parameters for multilayered system

Dear all, Could you please explain me how I can put hopping parameters for a multilayered system with  kwant.builder.HoppingKind(). The difficulty is that the intralayer hopping parameters are different for each layer and depend on the layer's position z. T he hopping integrals between neighbouring layers are the same. Thank you in advance. Cheers, Sergey