Assume that the z = 0 plane separates two lossless dielectric regions with _r1 = 2 and _r2 = 3. If we know that E_1 in region 1 is a_x2y - a_y3x + a_z(5 + z), what do we also know about E_2 and D_2 in region 2? Can we determine E_2 and D_2 at any point in region 2? Explain.