Figure 5.

Maps of the Mueller polarimetry parameters [(a) Azimuth $\alpha$ (in ${}^{\circ }$), (b) retardance R (in ${}^{\circ }$), (c) depolarization $\mathrm{\Delta }$] measured on sample 8 at different imposed stretches ($\lambda =1,\lambda =1.30,\lambda =1.45$).