Update README.md

README.md

@@ -80,19 +80,6 @@ This straightforward stacking ensures that the polarization vectors align as req
  ```
 a1=[1, 0, 0], b1=[0, 1, 1], c1=[0, 0, 1]
 a2=[1, 0, 0], b2=[0, -1, 0], c2=[0,0 -1]
-```
-## R3c
-The R3c domain walls are developed by converting reference R3c structure into a pseudocubic cell by cutting along (1-11) plane, which is also the polarization axis. The transformation matrix used to convert R3c structure into pseudocubic cell is given as:
-
-```
-\[
-A = \begin{bmatrix}
-1 & -1 & 1 \\
-1 & 1 & -1 \\
--1 & 1 & 1
-\end{bmatrix}
-\]
-
 ```
 
 # Usage