Heterogeneous cellular networks (HCNs) play a significant role in 5G networks. but have mainly been modeled and analyzed on a two-dimensional (2D) plane. In this paper. we model a three-dimensional (3D) two-tier HCN consisting of macro-cells and small-cells via a stochastic geometry approach. https://parisnaturalfoodes.shop/product-category/henna-natural/