I've elected to use the 2x articles below as my validated instruments for conducting my survery. I would like to contact the authors to request a copy of their survey questions and permission to use them to conduct my survey/questionnaire.
The first thing you need to pay attention to in the articles you have specified is who owns the rights to the materials in the articles. If the articles are in open access and the rights belong to the authors of the articles, then you can write them a letter to their Emails specified in the articles (usually the Corresponding author is indicated). You can offer these authors either co-authorship in your future article, or at the end of the article express gratitude to them for using their materials (in Acknowledgements). This point will be clarified during correspondence with the authors of these articles. In any case, you need to cite the used articles.
Second, if the rights to the articles belong to the publishers, then in addition to the authors, you need to write letters to the editors of the relevant journals so that they send you written permission to use the requested materials. Much depends on the policy of a particular publisher. Usually, on the official websites of scientific journals or publishers, you can find information on how to obtain permission to reuse materials. This should be done in advance, because sometimes the process of obtaining permission is not very fast.
Third, such a situation also happens. Even if the rights to the articles (in open access) belong to the authors, it is also necessary to obtain permission from the publisher. Such information can also be found on the official website of the magazine or publisher.