The phrase "another possible rationale for" is correct and usable in written English.
You can use it when introducing an additional reason or explanation for a particular argument or situation.
Example: "Another possible rationale for implementing the new policy is to improve employee morale and productivity."
Alternatives: "an additional reason for" or "a further justification for".
But my sidewalk encounter suggested a possible rationale for these purchases: they recalled an era when people were at least candid about their racial views.
These data provide the first possible rationale for the reduced viral load of patients treated with irradiated blood products containing T lymphocytes.
The spokesman laid down a possible rationale for an assault, saying that the rebels had used the shrine and the cemetery to stockpile arms and ammunition, and were fighting from behind tombs and headstones.
But, as far as I can tell, conservative opponents of immigration cite the potential for increased welfare spending as a justification for their position far more often than liberal supporters cite it as a possible rationale for their own.
That's the possible rationale for Ford: She could testify before the Senate Judiciary Committee under oath knowing that those she alleges were involved in or knew about the allegations had to tell the truth under penalty of law.
As a possible rationale for our results, we propose that increased DST variability may be the result of a re-stabilization strategy.
The transformation of vesicles into planar structures is proposed as a possible rationale for explaining the lower doses required when a liposome formulation is supplemented with surfactant PEs.
One of Pakistan's most wanted militants, Ilyas Kashmiri, was reported dead this month in a C.I.A. drone strike, part of an aggressive drone campaign that administration officials say has helped paralyze Al Qaeda in the region — and has become a possible rationale for an accelerated withdrawal of American forces from Afghanistan.
