import numpy as np

arr1 = np.array([
    [1, 2, 3, 4],
    [5, 6, 7, 8]
])
arr2 = np.array([
    [9, 10, 11, 12],
    [13, 14, 15, 16]
])

# Stacking 2D arrays #2
arr_stacked = np.stack([arr1, arr2], axis=1)
print('Numpy stacking 2D arrays method #2')
print('----------------------------------')
print(arr_stacked)