At 25C a single-crystal (Single domain) of BaTiO3 is tetragonal, point group 4mm. a. Using Neumann's Law, deduce the dielectric constant matrix. b. Measured values of the dielectric constants are and K=4100 K = 160 (X = constant stress) K=1970 K3 = 109 (x = constant stress) c. Why is K* different from K? Discuss how they might be measured. d. Plot (K*) as a function of direction, showing the geometric representation. Replot as a quadric surface.