Combine Ascending and Descending Images

Dear all,
I am new to SAR processing and require some assistance.
I am trying to combine two interferograms one from ascending and descending images to obtain 3D displacements . Can anyone help me with a tutorial link on such?

Have a look at this post please,

And this,

# Combining Sentinel-1 Ascending and Descending Data to Aspect Information in Term of the 3D Slope Creep Behavior

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I also think there are already enough topics on this. If you still have questions, try to follow up on a specific point there:

Two posts naming the formulas: