Gaussian and exponential stochastic medium models. The model size is 4 m × 4 m. The first row shows that the autocorrelation length (AL) of the Gaussian models is set to 7.66% (~0.31 m), 15.33% (~0.61 m), and 22.99% (~0.92 m) of the model size, respectively. The second row demonstrates the one-dimensional models extracted from the panel in the first row. The third row is the exponential model whose autocorrelation length is the same as in the first row. The fourth row is for one-dimensional models extracted from the panel in the third row.