Shalom! When one wears both Rashi and R Tam tefillin shel yad simultaneously, how should one tie the second (R Tam) strap? Is it left hanging, tied out of the way, tied over the top of the Rashi strap?
And is it permissible for both the Rashi and R Tam tefillin shel rosh to share a single strap? Is there a particular order from left to right on the head they must be in? Toda raba.
From what I have seen, the Rashi and Rabbeinu Tam straps are not tied one on top of the other, but separately. The Rabbeinu Tam straps hanging down are concealed behind the Rashi straps.