## 1 Introduction  
Deep and rapid economic, environmental and social changes are taking place, shaping the political, managerial and academic discourses [1; 2]. The industry is not exempt from these current macro-trends and opportunities arise for two specific paradigms, namely Circular Economy (CE) and Industry 4.0 (14.0) [3; 4].  
CE focuses on closing the material loop, shifting from a linear economy to a circular one, decreasing material extraction, waste disposal and, consequently, environmental pressure [5; 6]. CE can be applied at different levels, namely micro (single firm, from a single product to the advertisement), meso (industrial systems and networks) and macro (society or country) [6]. Although focusing more on an environmental perspective, it is impossible to separate CE from the economy and society, which links CE to the concept of strong sustainability [7; 8]. On the other hand, I4.0 enables intelligent factories and products, providing opportunities for enhanced performance in terms of production activities, organizational strategies, business models and skills [9; 10]. A central role in I4.0 is played by Digital Technologies (DTs) [11].  
The two concepts have been largely addressed in a separate manner; nonetheless, in the last years, they started being integrated [12]. From a general perspective, it is widely accepted that DTs can enable the CE transition [13]. DTs indeed allow more efficient and flexible processes [14], while also providing transparent access to product data and resource consumption [13]. Despite the growing interest in the role of DTs as an enabler for CE transition, some points remain still not properly addressed. Particularly, focusing on the CE micro level, the need for making the overall discourse more operational, addressing the different phases of the CE transition [15], has been underlined [16]. The Regenerate,Share, Optimize, Loop, Virtualize, Exchange (ReSOLVE) framework has been identified as an important tool to operationally guide industrial firms [17]; despite its relevance, only a few studies so far have focused on the enabling role of DTs in the context of the ReSOLVE framework. The majority of the contributions, indeed, still focus only on specific CE aspects, such as recycling or resource efficiency. On the other hand, contributions focusing on the ReSOLVE consider the role of very few and specific DTs. Both situations underlined the lack of an overall, comprehensive and integrated approach towards the investigation of the role of DTs as an enabler for CE.  
Based on the considerations above, the present work aims at conducting a systematic literature review, so to better understand the possible role of DTs within the context of the ReSOLVE framework. To the best of the authors' knowledge, such an analysis is still missing, and a detailed identification of the relationships among all the available DTs and the action areas of the ReSOLVE framework needs to be investigated.  
The remainder of the paper is structured as follows. We provided a background on the frameworks for the analysis of CE and DTs (Section 2). Following, we described the systematic literature review methodology, clearly outlining the steps (Section 3). After a descriptive evaluation of the results (Section 4), we analyzed the literature in terms of emerging themes, addressing the possible role of DTs in the context of the ReSOLVE framework (Section 5). We then discussed some specific issues for which additional research is necessary (Section 6). Finally (Section 7), we outlined pivotal implications of our study and paved the way for further research.