  In this letter, we introduce a novel mixed terahertz (THz)-radio frequency
(RF) wireless system architecture, which can be used for backhaul/fronthaul
applications, and we deliver the theoretical framework for its performance
assessment. In more detail, after identifying the main design parameters and
characteristics, we derive novel closed-form expressions for the end-to-end
signal-to-noise ratio cumulative density function, the outage probability, and
the symbol error rate, assuming that the system experiences the joint effect of
fading and stochastic antenna misalignment. The derived analytical framework is
verified through simulations and quantifies the system's effectiveness and
reliability. Finally, our results contribute to the extraction of useful design
guidelines.
