Specifically, the disorder is modelled as a complete rotation about the crystal b axis (or fibril axis, vertical in this figure) coupled with a 10 degree tilt.

• 好象是把一个弧看成一个点的旋转。推出这个点的大小。点的位置是假设一个倾斜角。再简化成单晶解。半年前看这文章的时候还真没明白。