Both "Electronic Engineering" and "Electronics Engineering" are acceptable ways to refer to the field of study that deals with the design and application of electronic circuits, devices, and systems. The terms are often used interchangeably and there is no strict rule governing which one is more correct.
In general, "Electronics Engineering" is more common and widely accepted as the correct term. This is because the word "electronics" refers specifically to the study of electronic circuits and systems, while "electronic" is a more general term that can refer to anything related to electricity or electronics.
However, it is not uncommon for universities and other educational institutions to use the term "Electronic Engineering" when naming their programs or courses. In this case, the use of "Electronic" is intended to convey the broader scope of the field, which may include topics such as computer engineering, electrical engineering, and telecommunications engineering, in addition to electronics.
Ultimately, it is important to use the term that is most commonly accepted and understood in your field or by your intended audience. If you are unsure which term to use, you can consult with colleagues or check with professional organizations or societies in your field to see which term they use.