Compute rotation matrix using the accelerometer?

To calculate the Euler angle you need to compute the angle between the reference vector and the current gravity vector.

I think that the following link it should be helpful Transforming iPhone Accelerometer Data to Automobile Axes pay attention there is a error in the rotation matrix, the element rm11 it should be cos"Beta"*cos"gamma" and not cos"alpha"*cos"gamma.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.