In the present study, structure and temperature field of flame in inclined opposite laminar premixed jets of landfill gas are investigated. Impinging of flame jets at different angles and jet-to-jet spacing pose new challenges for investigation of double-burners. The effects of key parameters such as Reynolds number (70-150), equivalence ratio (0.8-2.5), burners' intersecting angle (60 degrees-100 degrees), and jet-to-jet spacing (5/D-h = 3.84-9.6) were investigated by the Mach-Zehnder interferometry technique. The temperatures acquired from the 2D interferograms were compared with the thermocouple readings and the numerical simulation outcomes. The results clarified that by doubling the Reynolds number and reducing the angle between the two slot burners by 40 degrees, the difference between maximum temperatures is 4% and 3%, respectively. These variations have a limited influence on the maximum flame temperature, but the flame configuration differs significantly, while the equivalence ratio has a notable effect on both the structure and temperature of the flame. The maximum flame temperature varied 27% by changing the equivalence ratio from 2.5 to 1. Also, the configuration and temperature of the flame and the hot zone's location are strongly affected by the distance between burners. Numerical simulations indicated that the NOx emissions are directly correlated with the maximum flame temperature. (C) 2018 Elsevier Ltd. All rights reserved.