eps_0 = 8.85E-12
k_ox = 3.9

L = 90E-9       # 90nm expressed in meters
t_ox = 16E-10   # 16A expressed in meters

C_permeter = k_ox * eps_0 * L / t_ox
C_permicron = C_permeter * 1E-6

print(C_permicron)