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Heterogeneous cellular network (HCN) is structured on a multi-tier architecture comprising of macro-base stations (MBSs) and small-base stations (SBSs). MBS and SBS are deployed to accommodate a large number of users for the purpose of achieving higher data rates, coverage, and improved outage performance. Recognized for its spectrum efficiency, nonorthogonal multiple access (NOMA) emerges as a viable multipleaccess technique for sixth-generation (6G) wireless networks. To maximize power efficiency and reduce outage probability, the power amplifier at the base station is operated close to saturation, which results in nonlinear distortions. Thus, it is vital to understand the fundamental performance guarantees of practical NOMA-enabled HCN systems (HCN-NOMA) under nonlinear distortions introduced by high power amplifiers (HPA). In this paper, we employ an analytical performance evaluation of …